Pump jack



July 27 1926. 1,593,794

5. M. CLEVELAND PUMP J ACK Filed July 7. 1925 o o ilfi faooooioooooooooo/Z I I f (Tubman- Patented July 27, 1926. v

UNITED STATES PATENT OFFICE.

PUMP JACK.

Application filed July 7, 1925. Serial No. 41,994.

The present invention relates to a pump jack such as are used in pumprigs for wells, and has for its prime object to provide a structure fortranslating reciprocating motion in one direction to reciprocatingmotion in another direction wherein there is utilized a wheel havingsprocket chains associated therewith being connected to the wheel atpoints in the same radius of the wheel and extending about the wheel inopposite directions, and a weight mounted on the wheel to hold the samenormally in a predetermined position. v

, Another important object of the invention lies in the provision of anexceedingly simple construction, one which is clearly reliable andeflicient in operation, strong and durable, inexpensive to manufacture,not likely to easily become out of order, and otherwise well adapted forthe purpose for which it is designed.

With the above and numerous other 011- jects in view as will appear asthe description proceeds, the invention resides in certain novelfeatures of construction, and in the combination and arrangement ofparts as will be hereinafter more fully described and claimed.

In the drawing Figure 1 is an elevation of the device embodying thefeatures of my invention, and

igure 2-is a bottom plan view thereof. Referring to the drawingin detailit will be seen that 5 designates a hub having a disc body 6 mountedthereon provided with a plurality of concentric rings? arranged on thefaces thereof; Adjacent each ring 7 there is provided in the disc body 6a plurality of apertures 8 so that sprocket teeth sections 9 may beattached about the ring by suitable fastening elements passingtherethrough and through the apertures 8. There will be a set of thesesections 9 on each side of the wheel. Spokes 10 radiate from theperiphery of the disc body and support a rim 11 provided with sprocketteeth 12.

A chain 13 has its end link 14 pivotally engaged with one of the spokes10, as is indicated at 15, and is trained about the rim 11 in engagementwith a portion of the s rocket teeth 12 as is clearly indicated inigure 1. Chain sections 16 have their end links lixed as at 17 to one ofthe end sections 9 so as to be in radial alignment with the pivot point15. These chain sections 16 are trained over the teeth' sections 9, andthen extend outwardly or tangentially so that the tangential portion ofthe sections are disposed at right angles to the tangential portion ofthe chain 13. A heavy weight 18 is fixed to two of the sprockets as isindicated at 19. There are preferably two of these weights, one on eachside of the wheel, and they normally hold the wheel in the positionshown in Figure 1. It will thus be seen that a pull to the left on chainsection 16 will rotate the wheel, thereby causing an upward pull by thechain 13. The weights will return these parts to their initial position.It is thought that the construction, operation, and advantages of thisinvention will now be clearly understood by those skilled in the artwithout-a more detailed description thereof. It is desired, however, topoint out that the leverage of the device can be changed by locating theteeth sections 9 adjacent difl'erent rings 7 as will be apparent.

The present embodiment of the invention has been disclosed merely by wayof example, since in actual practice it attains the various features ofadvantage enumerated as desirable in the statement of the invention, andthe above description. It will be apparent that numerous changes in thedetails of construction, and in the combination and arrangement of partsmay be resorted to without departing from the spirit or scope of theinvention as hereinafter claimed or sacrificing any of its advantages.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent is -A wheel of the class described including aplurality of concentric rings arranged thereon in spaced relation,removable sprocket teeth sections associated with the rings, a chainassociated with the teeth sections, and sprocket-teeth arranged aboutthe periphery of the wheel and having a chain associated therewith.

Intestimony whereof I aflix my signature.

BURNS M. CLEVELAND.

